Peptide purity is the percentage of the target sequence as determined by HPLC. The impurities found in a peptide will include deletion sequences, truncated sequences, and incompletely deprotected sequences. The non-peptide components (moisture, counter ions, salts, etc.) are not considered as impurities, but reduce the actual peptide content by certain percentage. Peptide content only gives information on the percent of peptide versus non-peptide components. It is determined by Amino Acid Analysis, which is available at the special request of the customer.